Submitted on: 27 September 2015.
Revised on: 19 December 2015.
Accepted on: 14 February 2016.
___________________Economic Systems---ELSEVIER
Submitted on: 16 April 2016.
Revised on: 09 June 2016.
Accepted on: 31 July 2016.
___________________Economic Systems---ELSEVIER
Submitted on: 27 December 2010.
Revised on: 06 February 2011.
Accepted on: 28 February 2011.
___________________Economic Systems---ELSEVIER
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http://reply.papertrans.cn/1/80/7955/7955-25.png
Submitted on: 13 May 2008.
Revised on: 27 June 2008.
Accepted on: 05 August 2008.
___________________Economic Systems---ELSEVIER
Submitted on: 06 July 2001.
Revised on: 15 September 2001.
Accepted on: 31 October 2001.
___________________Economic Systems---ELSEVIER
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http://reply.papertrans.cn/1/80/7955/7955-29.png
Submitted on: 26 May 2020.
Revised on: 07 July 2020.
Accepted on: 04 September 2020.
___________________Economic Systems---ELSEVIER